干湿循环对硬黏土的土水特性影响规律研究

doi:10.13722/j.cnki.jrme.2015.1509

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (570 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要为了客观评估高放核废物地质处置库开挖建设和封存初期围岩面临的非饱和岩土力学问题，针对一种高放核废料储存介质(硬黏土)开展不同干湿循环试验，研究该材料的土水特性变化规律。基于湿度控制吸力方法，研制黏土非饱和测量系统，利用该系统对硬黏土进行不同干湿循环试验，对比分析干湿循环次数和基质吸力变化梯度对硬黏土的土水特征曲线的影响。研究结果发现：干湿循环次数对这种硬黏土的土水特征曲线影响较大，基质吸力变化梯度影响则很小。同时，结合不同干湿循环条件下硬黏土核磁共振细观测试结果，分析出干湿循环和基质吸力对硬黏土的土水特性影响机制。通过分析不同干湿条件下硬黏土的含水分布特征，定量出该硬黏土干湿过程不同孔径内含水变化，揭示其不同孔径含水量等比例变化与水的吸附状态密切相关，为深入理解硬黏土干湿循环过程土水特征曲线变化规律提供试验依据，为高放核废物地质处置围岩水力特性评估奠定试验基础。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	陈留凤1
	2
	彭华1

关键词 ：土力学, 高放核废料地质处置, 硬黏土, 干湿循环, 土水特征曲线, 核磁共振, 孔径分布

Abstract：In order to understand the unsaturated host medium of the high-level radioactive nuclear waste disposal repository in deep geological formation，a series of hydration and dehydration tests were performed on the hard clay which has been considered as the potential host medium for storage of the high-level nuclear waste. A suction control device was developed and the effects of suction cycles and suction gradients on the hard clay were investigated. The results showed that the suction gradient had little effect on the suction-water content relation，while the suction cycle has great effect on it，particularly the first cycle of hydration and dehydration. Nuclear magnetic resonance(NMR) method was used to study the water distribution during desaturation. The experimental results showed that the curves gave the evidence of the dependence of water content of the hard clay on the suction. The relationship between the water distribution and the pore size distribution was established. The water content variation during the hydration and dehydration depends on the state of adsorbed water.

Key words： soil mechanics high-level radioactive nuclear waste hard clay suction cycles soil-water characteristic curve(SWCC) nuclear magnetic resonance(NMR) pore size distribution

引用本文:

陈留凤1，2，彭华1. 干湿循环对硬黏土的土水特性影响规律研究[J]. 岩石力学与工程学报, 2016, 35(11): 2337-2344.
CHEN Liufeng1，2，PENG Hua1. Experimental study on the water retention properties of the hard clay under cyclic suction conditions. , 2016, 35(11): 2337-2344.

链接本文:

http://rockmech.org/CN/10.13722/j.cnki.jrme.2015.1509 或 http://rockmech.org/CN/Y2016/V35/I11/2337

[25]	LU N，WILLIAM J L. Unsaturated mechanics[M]. Hoboken，New Jersey：John Wiley and Sons，Inc.，2004：121-129. " target="_blank">
[20]	吴宏伟，陈锐. 非饱和土试验中的先进吸力控制技术[J]. 岩土工程学，2006，28(2)：123-128.(NG C WW，CHEN Rui. Advanced suction control techniques for testing unsaturated soils[J]. Chinese Journal of Geotechnical Engineering，2006，28(2)：123-128.(in Chinese))
[4]	ROMERO E，GENS A，FLORET A. Temperature effects on the hydraulic behaviour of an unsaturated clay[J]. Geotechnical and Geological Engineering，2001，19(3/4)：311-332. " target="_blank">
[6]	刘文华，杨庆，唐小微，等. 干湿循环条件下不同初始干密度土体的力学特性[J]. 水利学报，2014，45(3)：261-268.(LIU Wenhua，YANG Qing，TANG Xiaowei，et al. Mechanical behaviors of soils with different initial dry densities under drying-wetting cycle[J]. Journal of Hydraulic Engineering，2014，45(3)：261-268.(in Chinese))
[7]	张俊然，许强，孙德安. 多次干湿循环后土-水特征曲线的模拟[J]. 岩土力学，2014，35(3)：689-695.(ZHANG Junran，XU Qiang，SUN Dean. Simulation of soil-water characteristic curves during drying and wetting cycles[J]. Rock and Soil Mechanics，2014，35(3)：689-695.(in Chinese))
[9]	张芳枝，陈晓平. 反复干湿循环对非饱和土的力学特性影响研究[J]. 岩土工程学报，2010，32(1)：41-46.(ZHANG Fangzhi，CHEN Xiaoping. Influence of repeated drying and wetting cycles on mechanical behaviors of unsaturated soil[J]. Chinese Journal of Geotechnical Engineering，2010，32(1)：41-46.(in Chinese))
[11]	龚壁卫，吴宏伟，王斌. 应力状态对膨胀土SWCC的影响研究[J]. 岩土力学，2004，25(12)：1 915-1 918.(GONG Biwei，NG C WW，WANG Bin. Influence of stress states on soil-water characteristics ofexpansive soils[J]. Rock and Soil Mechanics，2004，25(12)：1 915- 1 918.(in Chinese))
[14]	BERNIER F，LI X L，BASTIAENS W. Twenty-five years? geotechnical observation and testing in the Tertiary Boom clay formation[J]. Géotechnique，2007，57(2)：229-237. " target="_blank">
[17]	LIMA A. Thermo-hydro-mechanical behaviour of two deep Belgian clay formations：Boom and Ypresian clays[Ph. D. Thesis][D]. [S.l.]：Universitat Politècnica de Catalunya，2011. " target="_blank">
[1]	李军，刘丰银，王磊，等. 关于土水特征曲线滞回特性影响因素的研究[J]. 水利学报，2015，46(增1)：194-199.(LI Jun，LIU Fengyin，WANG Lei，et al. A research of affect factor on hysteresis behavior for soil-water characteristic curve[J]. Journal of Hydraulic Engineering，2015，46(Supp.1)：194-199.(in Chinese)) " target="_blank">
[16]	DENG Y F，CUI Y J，TANG A M，et al. An experimental study on the secondary deformation of Boom Clay[J]. Applied Clay Science，2012，59-60：19-25. " target="_blank">
[3]	FREDLUND D G，XING A. Equations for the soil-water characteristic curve[J]. Canadian Geotechnical Journal，1994，31(4)：521-532. " target="_blank">
[5]	叶为民，万敏，陈宝，等. 干湿循环条件下高压实膨润土的微观结构特征[J]. 岩土工程学报，2011，33(8)：1 173-1 177.(YE Weimin，WAN Min，CHEN Bao，et al. Micro-structural behaviors of densely compacted GMZ01 bentonite underdrying/wetting cycles[J]. Chinese Journal of Geotechnical Engineering，2011，33(8)：1 173-1 177.(in Chinese))
[13]	TSANG C F，BERNIER F，DAVIES C. Geohydromechanical processes in the excavation damaged zone in crystalline rock，rock salt，and indurated and plastic clays in the context of radioactive waste disposal[J]. International Journal of Rock Mechanics and Mining Sciences，2005，42(1)：109-125. " target="_blank">
[15]	YU H D，CHEN W Z，JIA S P，et al. Experimental study on the hydro-mechanical behavior of Boom clay[J]. International Journal of Rock Mechanics and Mining Sciences，2012，531(1)：159-165. " target="_blank">
[23]	肖立志. 核磁共振成像测井与岩石核磁共振及其应用[M]. 北京：科学出版社，1998：86-105.(XIAO Lizhi. Nuclear magnetic resonance measurement for wells and rock and their applications[M]. Beijing：Science Press，1998：86-105.(in Chinese)) " target="_blank">
[2]	VAN GENUCHTEN M TH. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J]. Soil Science Society of America Journal，1980，44(5)：892-898. " target="_blank">
[8]	吕海波，曾召田，赵艳林，等. 膨胀土强度干湿循环试验研究[J]. 岩土力学，2009，30(12)：3 797-3 802.(LÜ Haibo，ZENG Zhaotian，ZHAO Yanlin，et al. Experimental studies of strength of expansive soil in drying and wetting cycle[J]. Rock and Soil Mechanics，2009，30(12)：3 797-3 802.(in Chinese))
[10]	叶为民，黄雨，崔玉军，等. 自由膨胀条件下高压密膨胀黏土微观结构随吸力变化特征[J]. 岩石力学与工程学报，2005，24(23)：4 570-4 575.(YE Weimin，HUANG Yu，CUI Yujun，et al. Microstructural changing characteristics of densely compacted bentonite with suction under unconfined hydrating conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(23)：4 570-4 575.(in Chinese))
[12]	李香绫，Bernier Frédéric，Bel Johan. 比利时高放废物处置库设计及与基岩和工程屏障体系的热-水-力性状的相关研究[J]. 岩石力学与工程学报，2006，25(4)：681-694.(LI Xiangling，Bernier Frederic，Bel Johan. The Belgian HLW repository design and associated R&D on the THM behavior of The host rock and EBS[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(4)：681-694.(in Chinese))
[18]	DECLEER J，VIANE A，VANDENBERGHE N. Mineralogical characteristics of the Rupelian Boom Clay[J]. Clay Minerals，1983，18(1)：1-10. " target="_blank">
[22]	DELAGE P，HOWAT M D，CUI Y J. The relationship between suction and swelling properties in a heavily compacted unsaturated clay[J]. Engineering Geology，1998，50(1)：31-48. " target="_blank">
[19]	AL-MUKHTAR M A，BELANTEUR N，TESSIER D，et al. The fabric of a clay under controlled mechanical an hydraulic stress states[J]. Applied Clay Science，1996，(11)：99-115. " target="_blank">
[21]	弗雷德隆德D G，拉哈尔佐H. 非饱和土土力学[M]. 陈仲颐，译.北京：中国建筑工业出版社，1997：254-267.(FREDLUND D G，RAHARDJO H. Soil mechanics for unsaturated soils[M]. Translated by CHEN Zhongyi. Beijing：China Architecture and Building Press，1997：254-267.(in Chinese)) " target="_blank">
[24]	田慧会，韦昌富. 基于核磁共振技术的土体吸附水含量测试与分析[J]. 中国科学：技术科学，2014，44(3)：295-305.(TIAN Huihui，WEI Changfu. A NMR-based testing and analysis of adsorbed water content[J]. Scientia Sinica Technological，2014，44(3)：295-305.(in Chinese))